To enable NTP on the vCenter Server Appliance 6.0:

1. Open a console session to the vCenter Server Appliance and press ALT+F1.
2. Log in using the root user credentials.
3. Run this command to view the current settings:

   ntp.get

   For example:

   Config:
   Status: Down
   Servers:
   

4. Run this command to add an NTP server:

   ntp.server.add –servers ntp_servername

5. Run this command to enable the NTP server:

   timesync.set –mode NTP

6. Run this command to verify the NTP server settings:

   ntp.get

Note: To remove an NTP server, run this command:

ntp.server.delete –-servers ntp_servername